Regular Expressions 101

Positive Lookbehind(?<=<!--)

<!--the literal text <!--

.*any character (except for line terminators), repeated any number of times

patternthe literal text pattern (case sensitive)

.*any character (except for line terminators), repeated any number of times

Positive Lookahead(?=-->)

-->the literal text -->

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<=<!--).*pattern.*(?=-->)

New

<!-- foo pattern -->
<!-- some commented out stuff pattern --> pattern
<!-- some commented pattern out stuff --> pattern
pattern <!-- pattern some commented out stuff -->
pattern <!-- some commented pattern out stuff --> <h1>pattern</h1>

<!-- some commented out stuff --> pattern
<!-- some commented out stuff --> pattern
pattern <!-- some commented out stuff -->
pattern <!-- some commented out stuff --> <h1>pattern</h1>